"The dispute began with complaints from Lula’s campaign about how Meta’s digital platforms work…Meta has denied deliberately favoring any candidate. It blamed the earlier problems on technical failures."
https://www.panamericandispatch.org/p/meta-ignores-brazilian-court-order
Could be deliberate, or just taking advantage of how all large platforms have bugs and moderation failures all the time. Difference in treatment can be whose issues get attention and faster fixes
(No Kings in the USA didn't get a quick fix from Meta either fwiw)